1. [adv]  intentionally so written (used after a printed word or phrase)
2. [v]  urge a dog to attack someone

SIC is a 3 letter word that starts with S.

1. \Sic\, a.
   Such. [Scot.]
   
   

2. \Sic\, adv. [L.]
   Thus.
   
   Note: This word is sometimes inserted in a quotation [sic],
         to call attention to the fact that some remarkable or
         inaccurate expression, misspelling, or the like, is
         literally reproduced.